Navigation flow is different while going forward and backward

### Version :
- react-native-router-flux v4.0.6
- react v16.8.3
- react-native v0.59.9

Hi,
Since I am using drawer so I have use back button of android to go back. The flow of navigation that I tested was :
RideNow=> Help => FAQs.

### Expected behaviour

- on pressing back button
FAQs => Help => RideNow

### Actual behaviour

- on pressing back button
FAQs => RideNow

###App.js

```

```

### - If I remove drawer it works fine.